CQ218I-40D

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Thyristors - TRIACs

The CQ218I-40D is a kind of TRIAC (or thyristor) which stands for a Triode for Alternating Current. It is a three-terminal solid-state semiconductor device characterized by bidirectional symmetric current conduction and having a reverse voltage blocking capability. TRIACs are used for AC switching and phase control applications, such as variable frequency drive, inverters, and motor speed controllers.

Overview

TRIACs are a type of solid-state semiconductor device designed to be used in controlling and switching of AC signals. It consists of two back-to-back SCRs in the same package and is a three-terminal device (the traditional Thyristor) with four fields separated by contrasting PN junctions. The main applications of a TRIAC are to control AC signals such as controlling current, controlling power, switching, reversing, and field control. In comparison to other thyristors, TRIACs have the feature of full-wave control, meaning it can also switch both the positive and negative half-cycles of the AC waveforms.

CQ218I-40D Application Field and Working Principle

The CQ218I-40D is known for its wire-free replacement, its high efficiency, reliable welding, and the ability of the built-in thermal protector to prevent overheating. It is widely used in industrial electric appliances, such as electric heaters, microwave ovens, electric ovens, refrigerators and washing machines. The CQ218I-40D has a high electric energy conversion efficiency, which is over 99%. It is designed for both low and high-power alternating current applications, and is suitable for single-phase AC, two-phase AC and high voltage power supply applications. The device is triggered by a short, voltage pulse at its Gate terminal and provides bidirectional symmetrical(positive and negative) current conduction for the entire AC load cycle segment.

Component Features

The CQ218I-40D contains both sensitive and standard modes. In the sensitive model the Gate current and Trigger Voltage requirements are lower than in the standard mode. This model also features a built-in temperature protector to prevent overheating and offers a high energy conversion efficiency greater than 99% to ensure reliability and durability.

Conclusion

In conclusion, the CQ218I-40D is a type of TRIAC (or thyristor) designed to be used in alternating current applications, such as variable frequency drives, inverters, and motor speed controllers. It offers bidirectional current conduction to control both positive and negative AC cycles, as well as a high energy conversion efficiency and a built-in thermal protector to prevent overheating. The CQ218I-40D is suitable for a variety of industrial electric appliances and is commonly used for single-phase, two-phase and high voltage power supply systems.

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